A display apparatus of a display system which includes a plurality of display apparatuses including: a display unit; a signal processor which processes an image signal supplied from outside, based on setting information stored in advance in the display apparatus, which displays an image on the display unit based on the processed image signal; a connector which is connected to an external storage device which stores the setting information of the display apparatus; and a controller which, if the external storage device is connected to the connector at a time when the setting information of the display apparatus is initially set, obtains the setting information from the external storage device and stores the setting information in the display apparatus, and updates the setting information stored in the external storage device corresponding to another display apparatus of the plurality of display apparatuses.